At+Creg Network Registration - Multi-Tech MultiModem EDGE Reference Manual

8.5 AT+CREG Network Registration

The AT+CREG command serves to verify the network registration status of the ME. For this
Description:
purpose two types of URCs are available.
The AT+CREG read command returns the URC presentation mode <n> and an integer <stat>
that shows the registration status of the ME. The location information elements <lac> and <ci>
are returned only when <n>=2 and ME is registered to the network.
Test Command Syntax:
Response(s):
Read Command Syntax:
Response(s):
Write Command Syntax:
Response(s):
Unsolicited Result Codes:
URC 1
If <n>=1 and there is a change in the ME network registration status:
+CREG: <stat>
URC 2
If <n>=2 and there is a change in the ME network registration status or a change of the network cell:
+CREG: <stat>[, <lac>, <ci>]
Parameter Descriptions:
<n>
0 Disable +CREG URC. Default.
1 Enable URC +CREG:<stat> to report status of network registration
2 Enable URC +CREG:<stat>[,<lac>,<ci>] to report status of network registration including location
information. Optional parameters <lac> and <ci> will not display during calls or if these values
have not changed since last AT+CREG read command or since last indication by +CREG URC.
<stat>
0 Not registered. ME is currently not searching for new operator.
Normally, status 0 occurs temporarily between two network search phases (Status 2). However,
if it persists, one of the following reasons may apply:
•
Automatic network selection is active, but probably there is:
∗
∗
∗
•
Manual network selection is active, and the selected network is available, but login fails due
to one of the following reasons:
∗
∗
∗
In either case, user intervention is required. Yet, emergency calls can be made if any network is
available.
1 Registered to home network
2 Not registered, but ME is currently searching for a new operator.
The ME searches for an available network. Failure to log in until after more than a minute may be
due to one of the following causes:
• No network available or insufficient Rx level.
• The ME has no access rights to the networks available.
• Networks from the SIM list of allowed networks are around, but login fails due to one of the
following reasons:
After this, the search will be resumed (if automatic network search is enabled).
•
The Home PLMN or an allowed PLMN is available, but login is rejected by the cell (reasons:
Access Class or LAC).
If at least one network is available, emergency calls can be made.
Multi-Tech Systems, Inc. AT Commands for EDGE Modems (S000371G)
AT+CREG=?
+CREG: (list of supported<n>s)
OK
AT+CREG?
+CREG: <n>, <stat>[, <lac>, <ci>]
OK
ERROR
+CME ERROR: <err>
AT+CREG=[<n>]
OK
ERROR
+CME ERROR: <err>
No SIM card available
No PIN entered
No valid Home PLMN entry found on the SIM
#11 ... PLMN not allowed
#12 ... Location area not allowed
#13 ... Roaming not allowed in this location area
∗
#11 ... PLMN not allowed
∗
#12 ... Location area not allowed
∗
#13 ... Roaming not allowed in this location area
Chapter 8 – Network Service Commands
104